Display Bottom bar on screen tap

Hello!

I am really new to sencha but I am happy I have found you.

I am developing an app that is basically an ebook. I want my users to be able to read the book and when they tap on the screen I want the bottom bar to appear so they can go to a "credits" or "about us" section.

I am using the carousel as my main component but I have no idea how to make the bottom bar appear when the users tap on the screen.